Telephone system



Oct. 6, 1942. E. L. ERwlN 'Er Al.

TELEPHONE SYSTEM Filed March 23. 1940 28 Sheets-Sheet 1 WW1." I AToRA/Ev By MTW Flc. 2

JUNCTOR C/RCU/T ot. 6, 1942.y

E. L. ERWIN ETAL TELEPHONE 'SYSTEM Filed March 2s. 1940 /NVN ToRs- 28 Sheets-Sheet 2 E L. ERW//v 'F.R. AMBER ry BY 'Luvkwwh'm'ng y ATTORNEY Oct. 6, 1942. E. l.. ERwlN ETAL TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 3 ,5, 1 ERw//v ME mmf'. RLAMBERTY @y Wrwdcw,

A TTORNEV m. UP*

Oct. 6, 1942. E. L. ERwlN :a1-AI. 2,298,205

` TELEPHONE SYSTEM Y n Filed March as, 1940 28 sheets-smet 4 CALL OR/G/NAT/NG L/NE SWITCHES A 7' TORNEY Oct. 6, 1942.

E. L. ERwlN Er AL TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 5 m. .Qi

' 5 L. ERW//v Mmm-RSF. R. LAME/ery A from/Ev Oct. 6, 1942.l E. L. RWIN r-:rAL

TELEPHONE SYSTEM' Filed March 2s, 1940 2a sheets-sheet 5. L. ERM/v NVENTORSF R; LAMBERTY E WYWWW? A TTQRA/Ev Oct. 6, 1942. E. L. ERWIN ETAL.

TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 7 ,5L Rw/N -MVENTORSR R. LAMBERW ATTORNEY oct. s, 1942.

E. L. ERWIN ETAL TELEPHONE sYs'rIEM Filed March 23,V 1940 28 Sheets-Sheet 8 l7"'. R. LAMBERTY A T TORNEV Oct, 6, 1942. E. l.. ERwlN E-rAL 2,298,205

l TELEPHONE SYSTEM n Filed Maron 23, 1940 28 sheets-sheet 9 mun/rs ro rau/w CIRCUIT ARECORDER AND TRUNK CRCU/T necanoens" LW- J yro Enanos/e cmcu/r .L'ERW//v f Mmm F. R. L-AMBERTY BV l MVWWM 'ATTORNEY l Oct. 6, 1942.l

E, L. ERWIN E TAL TELEPHONE SYSTEM Filed March 23. 1940 28 Sheets-Sheet 10 E. L. ERw//v Mmm F. R. LAMBERTV www ATroRA/Ey i olf-v 6, 1942- E. L. ERwlN ErAL 2,298,205

TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 11 MARKER c/ncu/r E. L. ERw//v F R. LAMBERTV A TTORNEV /N VE N TOPS Oct. 6, 1942. E. L. ERWIN E'rAl. 2,298,205.

TELEPHONE vSYSTEM Filed March '23, 1940 2s sheets-Sheet 12 N\ ...Sk

Oct. 6, 1942.

E. L. ERWIN ET AL" 2,298,205

TELEPHONE` SYSTEM 28 Sheets-Sheet 13 `Filed March 23, 1940 Q si ELE/@MN y '/NVENTORS ER. LAMBE/QTV Oct. 6, 194,2. E. L. ERWIN ET AL TELEPHONE SYSTEM Filed March 23. 1940 28 Sheets-Sheet 14 R. LAMBERTV BV A TTRNEV Oct. 6, 1942. y l:.l .v ERWIN ET Al. 2,298,205

TELEPHONE SYSTEM I Filed March 23, 1940 ZS'SheetS-Sheet l5 EL ERw//v /NVENTORS-m. AMBERTV OC- 6, 1942- E. ERwxN ET AL 2,298,205

TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 16 MARKER C /RC U/ T E. 1 ERw//v /NVEN To E R. AMBER Ty A T TORNE V 2 ocr; e, 1942. 'E. L. ERwlN Em TELEPHONE SYSTEM Filed March 2s. 1940 2a sheets-sheet 1v N\ ...Ek

E. L. ERw//v l NVEWORS' F. n. AMBER rr ATTORNEY l Oct. 6, 1942. E. L.. ERWIN Erm.

' v2,298,205 TELEPHONE SYSTEM l 28 Sheets-Sheet 18 Filed March 23, 1940 ELE/PMN /Nl/E/VTORSE "9 MAW/Wim ATTORNV Oct. 6, 1942. E. 1..,ERwlN ETAL 2,298,205

' TELEPHONE SYSTEM Filed March 23, 1940 28 Sheets-Sheet 19 A TToRA/fv' Oct. 6, 1942.

E. L.. ERwlN ET AL TELEPHONE SYSTEM Filed March 23, 19,40 28 Sheets-Sheet 20 E L. ERM/v "NVEWORS'ER AMBER rr A TTORNE V 

